Wiktionary
a. (context anatomy biology histology English) Of or pertaining to an apocrine gland or to its mode of secretion, which involves the budding of portions of the secreting cells.
WordNet
adj. (of exocrine glands) producing a secretion in which part of the secreting cell is released with the secretion; "mother's milk is one apocrine secretion" [ant: eccrine]
Wikipedia
Apocrine is a term used to classify exocrine glands in the study of histology. Cells which are classified as apocrine bud their secretions off through the plasma membrane producing membrane-bound vesicles in the lumen. The apical portion of the secretory cell of the gland pinches off and enters the lumen. It loses part of its cytoplasm in their secretions. Apocrine glands are found primarily in the breast of lactating mammals (i.e. the mammary glands are apocrine glands).
Secretion occurs when the release of secretory materials is accompanied with loss of part of cytoplasm. Apocrine secretion is less damaging to the gland than holocrine secretion (which destroys a cell) but more damaging than merocrine secretion ( exocytosis). An example of true apocrine glands are mammary glands, responsible for secreting breast milk.
Usage examples of "apocrine".
Though sweat is mostly water, it is the small amount of protein and fatty acids in the apocrine sweat glands that gives armpit sweat that wonderful milky or yellow color.
Glandular hyper‑activity in a wicker amphora: eccrine and apocrine glands poured forth sweat and stink, as if I were trying to shed my fate through my pores.
Some of those ridiculous hirsute regions have associated apocrine glands, with secretions that will surely stink once the atmospheric bacteria get to work on them.
Turbulent emotion, particularly terror, stimulated the apocrine glands in the armpits and the groin.